Bolt and nut lock.



D. D. TULLOOH.

BOLT AND NUT LOCK.

APPLICATION FILED 00124, 1913.

1,097,484. Patented May 19, 1914.

WITNESSES INVENTOR a MQ fiawzcififz'aZ/oa/z:

ATTORNEYS cow/01am PLANOGIIAPH cu, WASHINGTON. l). c.

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LOQVAS L Specification of Letters Patent.

BOLT AND NUT LOCK. i l 1 Patented May 19, 1914:.

Application filed October 24, 1913. Serial No. 797,031.

To all whom it may concern:

Be it known that I, AVID D. TULLoor'I, a subject of the King of GreatBritain, and a resident of Newark, in the county oi Essex and State ofNew Jersey, have invented a new and Improved Bolt and Nut Lock, of whichthe following is a full, clear, and exact description.

This invention relates to an improved bolt and nut lock, the deviceembodying improved means of this character "for preventing displacementof a bolt with respect to the objects held and also displacement of thenut on the bolt, the improvement consisting more especially in the nutretaining means whereby the nut is held from turning in eitherdirection.

A further object of the invention is to provide an improved bolt and nutlock in which a bolt of uniform dimensions with respect to the standardsize bolts used. is designed for coijperation with a nut of specialdesign in that it is increased in thickness and counterbored to receivea plug attached to the bolt and torn'iing means to lock the nut to thebolt against rotation.

iVith the above and other objects in view, the invention resides moreparticularly in the peculiar combinations and arrangement of parts whichwill be illustrated as a preferred embodiment in the accompanyingdrawings and described in the specification.

Reference is to be had to the accompanying drawings forming a part ofthis speciiication, in which similar characters of reference indicatecorresponding parts in all the views, and in which- Figure 1 is a sideelevation of a bolt partly in section with the improved locking deviceapplied thereto, the latter being also shown in section; Fi 2 is a frontelevation of the structure shown in Fig. 1 looking toward the lockingdevice; Fig. 3 is a side elevation of a fragmentary portion of a boltwith a modified form of locking device applied thereto, the latter beingshown in section; Fig. 1 is a front elevation of the structure shown inFig. 3; Fig. 5 is a similar view but showing the device in placeprevious to the application of the plate employed to prevent outwarddisplacement of the locking pin or key; and Fig. 6 is a sectional viewof the nut illustrated in Fig. i to show the screw stud to which theplate last mentioned is anchored.

in the form of the invention illustrated in liigs. 1 and 2 of thedrawings, the numeral 10 indicates a standard size bolt, usually it or 1in diameter, as commonly used irri-ailroad construction, although it isto be understood that the device is not limited to this particular use.The bolt is provided with the usual head 11 and standard size threads 12for a portion of its length extending to its free end, which end iscountcrbored and threaded internally as shown at 13, such threads beingcut left handed while the threads 12 are out right handed, or viceversa, the essential feature being that the threads are cut in oppositedirections. The nut 14 is engaged on the bolt and is made slightlythicker than the usual nut, being in the present instance preferablymade 1% thick while the usual nut is made 1 thick. This additionalthickness provides for the counterboring of the nut as shown at 15, thecounterbore being slightly larger than the threaded bore of the nut soas to provide a shoulder 16 designed to be contacted by a plug 17,preferably of circular form. This plug is provided with a reducedthreaded stem 18 which is threaded in the counterbore 18 so as to lieflush with the face of the nut and is adapted to be secured in positionby the engagement out a suitable tool or spanner wrench in a pair ofrecesses 19 in the outer face of the plug. The nut 14 is provided withdiametrically opposed and tapering openings or seats 20 adapted to alinewith a similar opening 21 transversely through the plug, whereby whenthe wedge pin or key 22 is forcibly passed through the same and heldfrom displacement by a split pin or gib key 23 passed through anaperture of the pin 22, said last mentioned pin will be held fromdisplacement, and as it serves to lock the plug to the nut, that is, twomembers which are oppositely threaded into position, it is obvious thattheir rotation will be absolutely prevented and that the nut willtherefore be held from displacement.

In the form of the invention illustrated in Figs. 3, 4-, 5 and 6 of thedrawings the bolt 24 is provided with the usual right hand threads 25,but in lieu of being counterbored as heretofore described, is providedwith a reduced extension 26 having left hand threads. A nut 27 isengaged on the bolt and is countcrbored as shown at 28 to receive acircular or other plug 29 which is oppositely threaded with respect tothe nut 27, on to the reduced threaded extension 26, and which lieswholly within the counterbore in the same manner as the plug 17, at thesame time contacting with the end wall or shoulder of the counterbore inthe nut. In order to lock the nut and plug together against rotation inthis form of the invention, the plug and nut are provided with coactingsemi-circular recesses or seats 30 in the peripheral edge of the plugand the inner edge wall of the counterbore, respectively, so as toreceive a cylindrical pin or key 31 which is forced into the circularaperture produced by these co-acting recesses. This pin 31 is providedwith a reduced portion 32 designed to extend normally beyond the face ofthe nut and plug and at a spaced point from this pin, the nut isprovided with a threaded recess in which is engaged a threaded stud 33in a manner to project from the face of the nut also. A connecting plate84 is passed over the projecting ends of the pin and stud and byriveting or upsetting the ends of the pin and stud, as shown at 35,provide enlarged heads, displacement of the plate with respect to thepin and stud thus being obviated. Furthermore, since the nut and plugare oppositely threaded members and are held against independentrotation by the pin 81, their displacement from the bolt is obviouslyprevented, while the connecting plate 84 which is attached to thethreaded stud serves as an anchoring means for the locking pin or key 31so as to prevent its displacement outward with respect to the nut andplug.

The novelty of the present invention. resides not only in the use of adevice which calls for an increase in the relative sizes of the parts,but more especially in providing a locking device in which a nut isengaged on a bolt and provided with a counterbore enlarged with respectto the stem of the bolt to receive a plug which is oppositely threadedto the bolt internally or externally, together with improved means forlocking the nut and plug together so that their independent rotation anddisplacement is quite impossible.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is 1. In a bolt and nut lock, the combinationwith a bolt having a threaded portion and a nut engaged thereon andprovided with a circular counterbore; of a plug oppositely threaded tothe bolt and snugly seated in the counterbore, and means engaged inco-acting openings of circular contour in the plug and nut for lockingthe plug to the nut and holding the latter against rotation of the bolt.

2. The combination with a bolt having a threaded stem and a nutthreading thereon, said nut having an extension provided with anenlarged circular counterbore and forming an interior shoulder; of acircular plug oppositely threaded through the bolt and snugly seated inthe counterbore wit-h its outer face flush with the face of the nut, alocking key engaged in alined seats in the nut and plug, and meansoutwardly of the nut to hold the key from displacement.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

DAVID D. TULLOOI-I.

\Vitnesses:

Gnonen BASSET, 7M. Gr. HOAR.

Copies 01 this patent may be obtained for five cents each, by addressingthe Commissioner of Patents Washington, D. C."

